Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Thread forming tap with a non-circular cross-section and radially extending cutting edges

a technology of cutting edge and cross-section, which is applied in the direction of manufacturing tools, wood boring tools, transportation and packaging, etc., can solve the problem of disadvantageous tap types

Inactive Publication Date: 2006-12-19
SANDVIK INTELLECTUAL PROPERTY AB
View PDF25 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]Hereby is achieved a thread forming tap that pre-forms an opening to a form suitable for thread forming, which in turn extends the working life of the tap, since better thread forming conditions are achieved.
[0006]Preferably, said edge extends substantially from the central axis of said elongated 30 body. Hereby, efficient forming of e.g. conical blind holes is achieved.
[0007]Suitably, a thread relief portion is provided between said thread forming portion and said open end, said relief portion being provided with a thread having a cut ridge having a substantially circular cylindrical form and being divided by a helical groove for allowing turning the tap away from said opening. Hereby, easy removal of the tap after thread forming is allowed.
[0009]Advantageously, the diameter of the thread of the thread forming portion increases from the level of the cut ridges of the relief portion. Hereby, thread forming is made possible.

Problems solved by technology

That kind of tap is however disadvantageous, as it can barely be used for other openings than circular cylindrical holes.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Thread forming tap with a non-circular cross-section and radially extending cutting edges
  • Thread forming tap with a non-circular cross-section and radially extending cutting edges
  • Thread forming tap with a non-circular cross-section and radially extending cutting edges

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019]FIG. 1 shows a thread forming tap 2, comprising an elongated body 4 having an axis A—A. The elongated body 4 has at a first end 6, a connector portion 8 and at a second end 10 a thread forming portion 12, and a thread relief portion 14. The tap 2 is preferably made of a high speed steel or a solid carbide material. The connector portion 8 is adapted to be connected to a tool holder of a drilling or milling machine.

[0020]The thread forming portion has a thread forming thread comprising a ridge 18 separated by a helical groove 20. The diameter of the thread 18 increases from the relief portion 14 towards the second end S and after a few pitches, the diameter is constant (however not circular, see below).

[0021]The thread relief portion 14 is provided with a helical thread having a cut (truncated) ridge 22 having a substantially circular cylindrical form separated by a helical groove 24. The cut ridge 22 has a smaller diameter than the largest diameter of the thread forming thread...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
circumferenceaaaaaaaaaa
speedaaaaaaaaaa
Login to View More

Abstract

A thread-forming tap includes an elongated body having, at first end, a connector portion, and having at a second end, a thread-forming portion. The thread-forming portion includes at least one thread-forming helical thread exhibiting a non-circular cross-section having at least three lobes for plastically deforming an interior wall of a workpiece while forming an internal thread therein. A thread relief portion formed by a helical truncated thread, is disposed between the thread-forming thread and a terminal end of the body. Disposed at the end of the elongated body is at least one radially extending cutting edge for cutting parts of the workpiece interior wall.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The thread 18 of the thread forming portion is non-circular (see FIG. 2). Instead, each flank is provided with a pointed thread part, each forming a lobe 30 for plastically deforming the interior wall of a hole while forming an internal thread.TECHNICAL BACKGROUND[0002]Such a thread forming tap is known from EP-A-0 767 024 (corresponding to U.S. Pat. No. 5,797,710). That kind of tap is however disadvantageous, as it can barely be used for other openings than circular cylindrical holes.SUMMARY OF THE INVENTION[0003]The object of the invention is to achieve an improved thread forming tap.[0004]This has been achieved by the tap of the initially defined kind, wherein at the open end of the elongated body, at least one radially extending edge is provided for cutting parts of the interior wall of said opening.[0005]Hereby is achieved a thread forming tap that pre-forms an opening to a form suitable for thread forming, which in turn extends the working...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): B23G5/06B23G7/00B23G7/02
CPCB23G7/02Y10T408/9048Y10T408/904B23G2210/16B23G5/06
Inventor HAKANSSON, BJORN
Owner SANDVIK INTELLECTUAL PROPERTY AB
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com